Blender scene animation exported to Three.js without bones or skinning?
Not sure if this is what you need, but it's a plugin for blender to export json for threejs.

https://github.com/mrdoob/three.js/tree/master/utils/exporters/blender

It has the instructions on how to install it.

To animate my stuff I use shapekeys. 
Try this tutorial :

https://www.youtube.com/watch?v=JKB4aPUkCJw

Hope that was helpful